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    <title>ShellCheck: SC3041 – In POSIX sh, set flag `-E` is undefined</title>
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    <h1>SC3041 – ShellCheck Wiki</h1>
    <a href="https://github.com/koalaman/shellcheck/wiki/SC3041">See this page on GitHub</a>
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    <h2 id="in-posix-sh-set-flag--e-is-undefined">In POSIX sh, set flag
<code>-E</code> is undefined</h2>
<p>(or any other option)</p>
<h3 id="problematic-code">Problematic code:</h3>
<div class="sourceCode" id="cb1"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb1-1"><a href="SC3041.html#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="co">#!/bin/sh</span></span>
<span id="cb1-2"><a href="SC3041.html#cb1-2" aria-hidden="true" tabindex="-1"></a><span class="bu">set</span> <span class="at">-EB</span></span></code></pre></div>
<h3 id="correct-code">Correct code:</h3>
<p>Switch to a shell that supports these options, such as Bash:</p>
<div class="sourceCode" id="cb2"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb2-1"><a href="SC3041.html#cb2-1" aria-hidden="true" tabindex="-1"></a><span class="co">#!/bin/bash</span></span>
<span id="cb2-2"><a href="SC3041.html#cb2-2" aria-hidden="true" tabindex="-1"></a><span class="bu">set</span> <span class="at">-EB</span></span></code></pre></div>
<h3 id="rationale">Rationale:</h3>
<p>Your script uses a shell feature not supported by the shebang. Either
rewrite the script to be portable, or change the shebang to explicitly
require a shell like Bash.</p>
<p>Most shell specific <code>set</code> flags are hard to emulate in
POSIX, so use your best judgement as to whether you can make do without
them, or if you should require a shell that supports them.</p>
<h3 id="exceptions">Exceptions:</h3>
<p>None</p>
<h3 id="related-resources">Related resources:</h3>
<ul>
<li>Help by adding links to BashFAQ, StackOverflow, man pages, POSIX,
etc!</li>
</ul>
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    <p style='font-size: 80%'><a href="../index.html">ShellCheck</a> is a static analysis tool for shell scripts. This page is part of its documentation.</p>
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